Magnetic brake



Sept. 22, 1931. c. FARMER 1,824,043

MAGNETIC BRAKE Filed Feb. 27, 1928 2 Sheets-Sheet 1 lff.

,l lv) INVENTOR my.; N CLYDE c.FARMER ATTORNEY Sepf. 22, 1931. c. c. FARMER MAGNETIC BRAKE 2 Sheets-Sheet 2 Filed Feb. 27, 1928 INVENTOR CLYDE C.FARMER f ATTORNEY Patented Sept'. 22, 1931 CLYDE c. FARMER., Aor.iriferi:emmen, PENNSYLVANIA, AssIGNon 'ro THE wnsrme- HOUSE AIR BRAKE COMPANY, OF `WILMERDING,. IEIEINNSYIV'ANVIA7 A CORPORATIUN F PENNSYLVANIA Y nomino. :ama

Y Application filed February 27l19`28. Serial No.) 257,134.

This invention relates to railway bra-kes;

and has for its principal object to provide a magnetic brake as` an auxiliary brake associated with a fluid pressure brake and oper` ative upon effecting a pn'eumaticemergency application of the brakes. y

In the accompanying drawings; Fig. 1 is a.l diagrammatic view o'a brake equipmcntembodying my invention ;4 Fig. 2 a View of a 104 modified form of that featureof my invention which involves Vthe operation of the magnetic brake upon effecting an emergenc applica.-l

tion of the brakes; Fig. 3 a view o afurther. I modication of the feature referred to 1n connection with Fig` 2; Fig. 4 asectional view of an emergency valve device modified to accomplish the purpose o my invention; Fig. 5 a diagrammatic view of anV automatic duid pressure brake employed Withthe con'-- structionv shown in Fig. 1 ;'Fig. 6 a sectional view of the brake valve shown inFg. 5, with the rotary valve in service application position; Fig. 7 a sectional view of the brake valve shownv in Fig. V5, with the. rotary `rvalve in emergency application position and Fig. 8

a more detailed view of the brake equipmenty associated with the Fig. aconstruction.` p y The brake equipment shown in-Fig.-1 comprises a brake shoe'l adapted to engage one Wheel 2 of a pair ofwheels and connected byk the usual brake beam to a similar brake shoe adapted to engage the other wheel and a brake shoe 3 adapted to engage a wheel4 of a m pairl of wheels and connected by the, usualbrake beam to a similar brake shoe adapted to engage the other Wheel ofthepairof wheels. V

The pair of brake shoes includingthe.brake k shoe 1 is operatively connected to a live lever 4o" 5 and the pair of brake shoes includingthe:

brake shoe 3 is operatively.' connected t0, a dead lever 6. The .levers 5 and y6 are connected by a rod 7 andthe outer end of lever 5f is connected to a pull `rod 8, which is operatively connected to the usual'fluid pressure brake cylinder (not shown), the outer endl of lever 6 being fulcrumed on a faedlportion A of the car.

A mavnetic brake shoe9 issuspended abovel each rail 10 by springs .11, which are secured at oneend to a fixed portion B of the car. Fulcrumed'nto a'iixed portion C of the car is a lever having the end of Yone arm 12 provided with a roller 13A adapted to engage aY surface of the brake shoe`9 and having the end of the other 'arm' 14 connected by a coil spring 15 with .the outer end of the live lever 5..

Fulcrumed `on aliz'ed portion D of the car is a lever, one arm 16 of which is'provided at 1 its outer end with a latch 17 adapted.- toengagea projection :18 carriedby the outer end .of lever. 1.4. .flh'e'other arm 19 of the latch lever isA adapted to be engaged by a stem 2O carried fa' piston 21 which is mounted in a d cylinder 22. The chamber at ,one side of the piston'21 is connected by a pipe 23 to 'an .engi-y neers brake valve device 24 and the chamber atl theopposite'side of the `piston contains. a

coil spring 25 which acts on piston 21;' "The i lever arm 16 carries a stem'26 to whiclris secu-red a switch member 27, the stem 26 being insulated from the contact member 27 by 4a section 28 of insulating material.

When the kswitch member 27 is moved up-k Y ward'ly, it is adapted to yconnect a` current,

supply wire 29 ywitll a wirey 30 connected to' the energizing coils `(not shown) ofthe magnetic brake shoe 9'.

- n operation, when'thebralres are released,

the parts are in the positions shown in Fig. 1 with the brakeshoes-ly and 3 held `away from the wheels and withthe magnetic brake shoe 9 held suspended away frompthe rail 10.

The latch'17,alsolengages the projection 18 of the lever arm 14. The ybrake valve being in release position, a cavity 46 inthe rotary valve 47 connects pipe 23 with aneXhaust port 48,. while uid under pressurevissupplied in the usual man- Y ner from'the main reservoir 49 through port 5 0 to the brake pipe 32. V T he brake pipe 32 is' connected to thepiston .chamber 51 of the usual triplevalve device 52, and `piston 53 moves the :slide valves 54 and 5,5 to release position, in-'v'vliich the valve .chamber 56 andY theauziiliaryreservoir 5.7 lare4 charged fromv the brake pipe 52,Y throughpfveed groove 58,.v

in the usual mannerI VVhen'the usual-Huid' vpressure brake ape` paratu's is to be voperatedto eiect a service the latch 17 remains in engagementwith/ the application of the brakes, the brake valve to normal position the latch 17 rides over the handle 31 of the brake valve 24 is turned projection 18 and drops back to its locking poto service application position, as shown in sition as shown. Fig. 6, and Huid under pressure is supplied Instead of operating the latch lever by to the usual brake cylinder to cause the brake fluid pressure supplied from the brake valve shoes 1 and 3 to be applied to the wheels 2 device .asin the'lFig. 1 construction, the latch and 4 through the pullexe'rted on the pull rod lever maybe operated upon a predetermined 8, fluid under pressure being supplied to the reduction in the brake pipe or emergency brake cylinder either directly or""ait''"`pi`pe, as -shown in Fig. 2. matically byoperationofthe triplevalve Ade# In this Case', the lbrake pipe oremergency 1710952, when the brake pipe pressureis rer.. pipe 32is connected 'to` the chamberv at one duced. side of the piston 21, the vpipe being'nor- In service application position of the brake mally. charged with fiuid under pressure. valve device 24 as well as in release position, The spring 25 actsv on the piston 21 in opthe pipe 23 is connected-to the atmosphere, position-to the luidfpressure and stem 20 through cavity 59 in the brake valve device,4 is provided with an end portion having an so'that spring 25 maintains `piston'21 inthe elongated slot rorrreceiving a 'pin 33 carried position shown in F ig. l'landgconsequently, by the lever arm 19. l,

y v With this form of the invention, when the projection 18er the lever'arni14,andthere4 pre'SSure'in the pipe 32 iS reduced t0 a dei; frevwhen the brake' lever `5 move'sfto apply grec for effecting an emergency application an emergency application of the brakes.`

the brakes in a service application, thelefver Of the hITaiSGSLthe spring 25 acts to move arm 14 is held against movement bythe latch PiSODZlV dO'WllWLidly, causing the stem 17 and the magnetic brake shoeis held inl- 20"'150 Operate the pin 33, so that the lever operative, y arm 19f moved downwardly and thereby Infthe emergency position of the brake theilihh 17 iS tripped flOni engagement With valve 24, a port 60 supplies Vfluid under presih@ PFOJGClOn 18, While the CQlC memsure from the main reservoir 49to the pipe hel .lsmoved to .close thev circuit of the 23,*Whil'e fluid under pressure is vented from' lenergpzing coils of the magnetic brake shoe the brake pipe 32 through Cavity 61l t0' effect 9, the operation `beingjsubstantially they same as that of the construotionshown in Fig. 1.

Fluid under pressure thus supplied. CCOiding t0 the' COnStfnCtiOIl ShOWIl in thmu'gh 13113623 to piston 21 Operates Said 1g. 3, the ilnidpr'essu're for operating the piston, so that vstem 20'moves downwardly to plvSl'l'l Supplied directly from the brake depress the lever arm 19. The latch 17 is Cylinder 34- When thepresnl'@ in the brak@ t then tripped out of engagement with thepr'o; cylinder l has beenincrjeased to a predeter jection 18 and consequently,'when the brakes ininedld'egieeils When an elneigency aPPii are pneumatically applied in effecting an CtiOnoftlie brakes is effected, the fluid presemergency application or the f brakes, the SnfeSnPPiindiO Piston 21 1S Sniiiieni, t0 01781 movement of the lever 5 operates through Cometh@ .PTGSSUIG 0f Spring. 25, S0 that the spring 15 to rotate the lever arm 14 toward ialSCh 'leven ViS then Operated n the Same the left. The arm 12 of the lever is conse- InanneiaS in the' CaSe 0f quently rotated, so that roller 13 acts to press ShQWn in 'F 1g; l y the brake shoe downwardly into engagement 'inf-Fig- 4 ,1S Shown ln Emergency 'ViVe with the ran 1o. The movement of the level;A device 'comprlsme a @asma 35 having a Pisarm 16 to trip the latch 17 valso causes the t0n Chainbnffh' COnneCted t0 an emergenti/LY Contact member 27 to-c1ose the circuit from brak@ P lPef37 and. Containing a Piston 3S the current supplywire 29 to the Wire 30,'s'o find'hailng a. VaiVehalnhel 39 ConneCted t0 the construction that the coils of the magnetic brake shoe-'9. -,Inilili TGSQIVOii' 'Supply Pipe 4 0, 21nd C011- are energized to magnetize the brake shoe and taining i Slide 'Vahle' 41@- ldapted tO he Oper-Y effect a braking vaction by the lfrictional enatedby Piston 38- v gagement of the brake shoe with the rail@ AS ShOYVnn Fig-I8 Pipe 23 lends t0 the When the brake valve handle 31 is moved toV Seat, 0f Silde-Vlfivedl and said pipe is conrelease position to letlect the release of theY necidto the lCylindeif 22 0f the itCh C011` brakes, fluid under pressure is vvented, from@ tiOihng-devinef Pipe 42 ieldS flOnl th Pipe 23, Permitting. piston 21130 be "shifted usual .brake cylinder? 34 to the seat of the upwardly by thegspring 25. The ma:A arm Siide valvqil and-nthenofmal release posi- 16 then moves to .normalpositiomby gravity tion ofthe emergency valve device, a cav-A so'that the'switch`meniber27 moves to open lty M 1D @Sh-de Valve LCOImects pipe 42v the Amagnetic brake circuit. When the brake With V Sllaizhtliiv Pipe '43 fnnprnlitiing shoe 9ism deenergized, thef'spring's ,l'meye-f the brakes tobe1opera ted by straight air to. the brake shoe away Vvfror'n the rail and cause effectaserviceapplCation ofthe brakes.

the lever arms 12 *and 14 t9 assume 4their11m-,2' VIn the release yposition of the usual braker mal release position,;as shownfinthedraw?l Valve deviceu24 as shown in Fig. y8, straight 1inh@ #mermaid .there niet @are 143,.. wenn@ fhfughica'vity :62

in the usual rotary valve-63 with exhaust port 64, while the emergency pipe 37 is supplied from rotary valve chamber 65, through port 66 with fluid under pressure from the main reservoir 57.

INhen the pressure-in pipe 37 is reduced to effect an emergency application of the brakes by moving the brake valve handle 31 toV emergency application position, the piston 38 is shifted to its outer emergency position, in which fluid at main reservoir pressure is supplied from valve chamber 39 to the brake cylinder 34 through pipe 42. In emergency position of slide valve 4l, a port 45 registers with pipe 23, so that fluid under pressure is supplied Vthrough pipe 23 to the piston 21, causing they latch lever to be operated in the same manner asin the case of the construction shown in'Fig. l.

Ihile one illustrative embodiment of the invention has been described in detail, it is not my intention to limit `its scope to that embodiment or otherwise than by the terms of the appended claims.

Having now described my invention, what I claim as new and desire to secure byLetters Patent, is

l. The combination with a fluid pressure brake and a magnetic brake shoe normally held suspended above the rail, of mechanism operated upon applying the fluid pressure brake for shifting the magnetic brake shoe to engagement with the rail, means for locking said mechanism against operation, and means operated upon applying the brakes for releasing said locking means to vpermitsaid mechanism to operate.

2. The combination with a fluid pressure brake and a magnetic brake shoe normally held suspended above the rail, of mechanism operated upon applying the fluid pressure brake for shifting the magnetic brake shoe to engagement with the rail, means for locking said mechanism against operation, a brake valve device for controlling the operation of said fluid pressure brake and having a service and an emergency application position, and means operative upon movement yof said brake valve device to its emergency application position for releasing said locking means.

3. The combination with a fluid pressure brake and a magnetic brake shoe normally held suspended above the rail, of mechanism operated upon applying the fluid pressure brake for shifting the magnetic ybrake shoeV lever device, and means operated upon applying the brakes for supplying fluid under pressure to said piston.

5. The combination with a magnetic brake shoe normally held suspended above the rail and a Wheel brake including a brake lever, of a lever device operatively connected to said brake lever and operated upon movement of the bra-ke lever to shift said brake shoe to engagement with the rail, a latch engaging saidlever device for preventing movement thereof, a piston device operated by fluid under pressure for shifting said latch to release said lever device, and a` brake valve device for controlling the brakes and having a brake applying position in which fliud under pressure is supplied to said piston.y

6. The combination with a magnetic rail brake shoe and a fluid pressure wheel brake operable to effect either a'service or an emergency application of the brakes, of mechanism for shifting said brake shoe to engage the rail, means for locking said mechanism against operation and for controlling theV circuitI through which current is supplied to said brake shoe, and means operated upon effecting an emergency application of the brakes for effecting the operation of said locking means yto permit said mechanism to my hand. e y

yCLYDE FARMER. 

